package com.ruoyi.web.controller.common;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.utils.sign.Base64;
import com.ruoyi.common.utils.uuid.IdUtils;
import com.ruoyi.system.service.ISysConfigService;

/**
 * 验证码操作处理
 *
 * @author ruoyi
 */
@RestController
public class CaptchaController
{
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisCache redisCache;

    @Autowired
    private ISysConfigService configService;
    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public AjaxResult getCode(HttpServletResponse response) throws IOException
    {
        AjaxResult ajax = AjaxResult.success();
        boolean captchaEnabled = configService.selectCaptchaEnabled();
        ajax.put("captchaEnabled", captchaEnabled);
        if (!captchaEnabled)
        {
            return ajax;
        }

        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        String captchaType = RuoYiConfig.getCaptchaType();
        if ("math".equals(captchaType))
        {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        }
        else if ("char".equals(captchaType))
        {
//            capStr = code = captchaProducer.createText();
            capStr = code = generateRandomCode(4);
//            image = captchaProducer.createImage(capStr);
            image = generateCaptchaImage(capStr);
        }

        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try
        {
            ImageIO.write(image, "jpg", os);
        }
        catch (IOException e)
        {
            return AjaxResult.error(e.getMessage());
        }

        ajax.put("uuid", uuid);
        ajax.put("img", Base64.encode(os.toByteArray()));
        return ajax;
    }
    private static String generateRandomCode(int length) {
        StringBuilder code = new StringBuilder();
        Random random = new Random();

        for (int i = 0; i < length; i++) {
            int digit = random.nextInt(10);
            code.append(digit);
        }

        return code.toString();
    }




        private static final int WIDTH = 160;
        private static final int HEIGHT = 60;
        private static final int FONT_SIZE = 40;
        private static final int X_OFFSET = 20;
        private static final int Y_OFFSET = 45;

        private BufferedImage generateCaptchaImage(String captchaText) throws IOException {
            BufferedImage bufferedImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2d = bufferedImage.createGraphics();

            Stroke stroke = new BasicStroke(3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
            g2d.setStroke(stroke);
            // 设置背景色
            Color grayTransparent = new Color(207, 207, 207, 128);
            g2d.setColor(grayTransparent);
            g2d.fillRect(0, 0, WIDTH, HEIGHT);

            // 设置字体
            Font font = new Font("Arial", Font.BOLD, FONT_SIZE);
            g2d.setFont(font);

            // 设置验证码文本颜色
            g2d.setColor(Color.BLACK);
            g2d.drawString(captchaText, X_OFFSET, Y_OFFSET);

            // 添加噪点
            Random random = new Random();
            for (int i = 0; i < 100; i++) {
                int x = random.nextInt(WIDTH);
                int y = random.nextInt(HEIGHT);
//                int rgb = Color.getHSBColor(random.nextInt(256), random.nextInt(256), random.nextInt(256));
                bufferedImage.setRGB(x, y,Color.white.getRGB());
            }

            // 释放Graphics2D对象
            g2d.dispose();
            return bufferedImage;
        }


}
